It’s a rare treat indeed when hardcore engine enthusiasts get to peek deep inside vintage and prototype high performance engine packages that never made it to production. On this site we’ve seen the unique internals of the Chevrolet 427 Mystery Motor and other rare engines and now we have an in depth look at a one-off all aluminum canted valve, crossram inducted Chevrolet small block evaluated for the ’69 Z/28.
This car has been featured multiple times in print magazines and their internet versions. All of them recognized that the engine is the single most defining component of this car, yet none of them chose to dig deep enough to bring their readers an insider’s look at this rare canted valve crossram 302ci powerplant. Instead they showed pretty pictures of tail lights, Camaro and Z28 emblems, wheel caps, interior, console instruments and so on; all standard items on any 1969 Z28. What the hell were they thinking? We figure you already know what a 1969 Z28 emblem looks like so check out these photos of the guts behind the glory.
This doubly unique engine is based on an aluminum, 4-inch bore block originally developed under Zora Duntov’s Corvette group. Engineer Bill Howell left the lab in 1967, but he says this engine would have been developed by the V8 group as it would have had to have production intent to be legal for the Trans Am racing series.